oj.uz

Submission #102510

# Submission time Handle Problem Language Result Execution time Memory
102510 2019-03-25T12:50:30 Z alexpetrescu Designated Cities (JOI19_designated_cities) C++14
33 / 100
 577 ms 34076 KB 
#include <cstdio>
#include <vector>
#include <algorithm>
#include <cassert>
#include <cstdlib>

//FILE *fin = fopen("a.in", "r"), *fout = fopen("a.out", "w");
#define fin stdin
#define fout stdout

#define ll long long

#define MAXN 200009

struct myc {
    int x, y, z;
};
std::vector < int > candidat[MAXN];
std::vector < myc > g[MAXN];
ll ans[MAXN], sumaTuturor;
int e[MAXN], desteptu[MAXN], istetu[MAXN];
bool viz[MAXN], luat[MAXN], seen[MAXN];
ll sum[MAXN], calc[MAXN], h[MAXN], cost[MAXN];
int t[MAXN], cine[MAXN], perm[MAXN];
int A, B, C;

void dfs1(int x) {
    viz[x] = 1;
    for (auto &y : g[x]) {
        if (viz[y.x] == 0) {
            dfs1(y.x);
            sum[x] += sum[y.x] + y.z;
        }
    }
}

void dfs2(int x, ll dinSpate) {
    viz[x] = 1;
    calc[x] = sum[x] + dinSpate;
    ans[1] = std::min(ans[1], sumaTuturor - calc[x]);
    desteptu[x] = x;
    for (auto &y : g[x]) {
        if (viz[y.x] == 0) {
            h[y.x] = h[x] + y.y;
            dfs2(y.x, dinSpate + sum[x] - sum[y.x] - y.z + y.y);
            if (h[desteptu[y.x]] > h[desteptu[x]]) {
                istetu[x] = desteptu[x];
                desteptu[x] = desteptu[y.x];
            } else if (h[desteptu[y.x]] > h[istetu[x]])
                istetu[x] = desteptu[y.x];
        }
    }
    if (h[desteptu[x]] + h[istetu[x]] - h[x] + calc[x] > h[A] + h[B] - h[C] + calc[C])
        A = desteptu[x], B = istetu[x], C = x;
}

void dfs3(int x) {
    viz[x] = 1;
    bool frunza = 1;
    desteptu[x] = x;
    for (auto &y : g[x]) {
        if (viz[y.x] == 0) {
            frunza = 0;
            h[y.x] = h[x] + y.y;
            t[y.x] = x;
            dfs3(y.x);
            if (h[desteptu[y.x]] > h[desteptu[x]])
                desteptu[x] = desteptu[y.x];
            luat[x] |= luat[y.x];
            if (luat[y.x] == 0)
                ans[2] += y.y;
        }
    }
    if(frunza)
        e[++e[0]] = x;
}

bool cmp(const int &a, const int &b) {
    return cost[a] > cost[b];
}

inline void solve(int n) {
    int rad = 0;
    for (int i = 1; i <= n; i++)
        if ((int)g[i].size() != 1)
            rad = i;
    ans[1] = sumaTuturor;
    dfs1(rad);
    for (int i = 1; i <= n; i++)
        viz[i] = 0;
    h[0] = cost[0] = -1000000000000000000LL;
    dfs2(rad, 0);
    for (int i = 1; i <= n; i++)
        viz[i] = 0;
    luat[A] = luat[B] = 1;
    h[C] = 0;
    dfs3(C);

    for (int i = 1; i <= n; i++)
        for (auto &x : g[i])
            if (t[x.x] == i)
                cost[x.x] = h[desteptu[x.x]] - h[i], cine[x.x] = desteptu[x.x];

    for (int i = 1; i <= n; i++)
        perm[i] = i;
    std::sort(perm + 1, perm + n + 1, cmp);

    int poz = 1;
    for (int i = 3; i <= e[0]; i++) {
        while (luat[perm[poz]])
            poz++;
        ans[i] = ans[i - 1] - cost[perm[poz]];
        int x = cine[perm[poz]];
        while (luat[x] == 0) {
            luat[x] = 1;
            x = t[x];
        }
    }
}

int main() {
    int n;
    fscanf(fin, "%d", &n);

    for (int i = 1; i < n; i++) {
        int x, y, z, t;
        fscanf(fin, "%d%d%d%d", &x, &y, &z, &t);

        g[x].push_back({y, z, t});
        g[y].push_back({x, t, z});

        sumaTuturor += z + t;
        ans[1] = std::min(z, t);
    }

    if (n > 2)
        solve(n);

    int q;
    fscanf(fin, "%d", &q);

    for (; q; q--) {
        int x;
        fscanf(fin, "%d", &x);

        fprintf(fout, "%lld\n", ans[x]);
    }

    fclose(fin);
    fclose(fout);
    return 0;
}

Compilation message

designated_cities.cpp: In function 'int main()':
designated_cities.cpp:123:11: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     fscanf(fin, "%d", &n);
     ~~~~~~^~~~~~~~~~~~~~~
designated_cities.cpp:127:15: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
         fscanf(fin, "%d%d%d%d", &x, &y, &z, &t);
         ~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
designated_cities.cpp:140:11: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     fscanf(fin, "%d", &q);
     ~~~~~~^~~~~~~~~~~~~~~
designated_cities.cpp:144:15: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
         fscanf(fin, "%d", &x);
         ~~~~~~^~~~~~~~~~~~~~~

Subtask #1
0 / 6.0

# Verdict Execution time Memory Grader output
1 Correct 12 ms 9728 KB Output is correct
2 Correct 11 ms 9856 KB Output is correct
3 Correct 12 ms 9856 KB Output is correct
4 Correct 11 ms 9856 KB Output is correct
5 Correct 10 ms 9856 KB Output is correct
6 Correct 13 ms 9856 KB Output is correct
7 Incorrect 8 ms 9856 KB Output isn't correct
8 Halted 0 ms 0 KB -

Subtask #2
7.0 / 7.0

# Verdict Execution time Memory Grader output
1 Correct 12 ms 9728 KB Output is correct
2 Correct 537 ms 29436 KB Output is correct
3 Correct 559 ms 31736 KB Output is correct
4 Correct 472 ms 29492 KB Output is correct
5 Correct 507 ms 29652 KB Output is correct
6 Correct 504 ms 30456 KB Output is correct
7 Correct 399 ms 29864 KB Output is correct
8 Correct 550 ms 33372 KB Output is correct
9 Correct 300 ms 28880 KB Output is correct

Subtask #3
9.0 / 9.0

# Verdict Execution time Memory Grader output
1 Correct 11 ms 9856 KB Output is correct
2 Correct 507 ms 29516 KB Output is correct
3 Correct 533 ms 31692 KB Output is correct
4 Correct 492 ms 29560 KB Output is correct
5 Correct 503 ms 29552 KB Output is correct
6 Correct 555 ms 30464 KB Output is correct
7 Correct 314 ms 30908 KB Output is correct
8 Correct 561 ms 34076 KB Output is correct
9 Correct 312 ms 28964 KB Output is correct

Subtask #4
0 / 17.0

# Verdict Execution time Memory Grader output
1 Correct 12 ms 9728 KB Output is correct
2 Correct 11 ms 9856 KB Output is correct
3 Correct 12 ms 9856 KB Output is correct
4 Correct 11 ms 9856 KB Output is correct
5 Correct 10 ms 9856 KB Output is correct
6 Correct 13 ms 9856 KB Output is correct
7 Incorrect 8 ms 9856 KB Output isn't correct
8 Halted 0 ms 0 KB -

Subtask #5
17.0 / 17.0

# Verdict Execution time Memory Grader output
1 Correct 12 ms 9728 KB Output is correct
2 Correct 537 ms 29436 KB Output is correct
3 Correct 559 ms 31736 KB Output is correct
4 Correct 472 ms 29492 KB Output is correct
5 Correct 507 ms 29652 KB Output is correct
6 Correct 504 ms 30456 KB Output is correct
7 Correct 399 ms 29864 KB Output is correct
8 Correct 550 ms 33372 KB Output is correct
9 Correct 300 ms 28880 KB Output is correct
10 Correct 11 ms 9856 KB Output is correct
11 Correct 507 ms 29516 KB Output is correct
12 Correct 533 ms 31692 KB Output is correct
13 Correct 492 ms 29560 KB Output is correct
14 Correct 503 ms 29552 KB Output is correct
15 Correct 555 ms 30464 KB Output is correct
16 Correct 314 ms 30908 KB Output is correct
17 Correct 561 ms 34076 KB Output is correct
18 Correct 312 ms 28964 KB Output is correct
19 Correct 11 ms 9728 KB Output is correct
20 Correct 501 ms 29480 KB Output is correct
21 Correct 577 ms 32008 KB Output is correct
22 Correct 479 ms 29432 KB Output is correct
23 Correct 517 ms 29528 KB Output is correct
24 Correct 547 ms 29560 KB Output is correct
25 Correct 555 ms 29432 KB Output is correct
26 Correct 505 ms 29560 KB Output is correct
27 Correct 474 ms 29564 KB Output is correct
28 Correct 483 ms 30532 KB Output is correct
29 Correct 516 ms 29432 KB Output is correct
30 Correct 481 ms 30000 KB Output is correct
31 Correct 399 ms 30076 KB Output is correct
32 Correct 553 ms 33584 KB Output is correct
33 Correct 308 ms 28964 KB Output is correct

Subtask #6
0 / 44.0

# Verdict Execution time Memory Grader output
1 Correct 12 ms 9728 KB Output is correct
2 Correct 11 ms 9856 KB Output is correct
3 Correct 12 ms 9856 KB Output is correct
4 Correct 11 ms 9856 KB Output is correct
5 Correct 10 ms 9856 KB Output is correct
6 Correct 13 ms 9856 KB Output is correct
7 Incorrect 8 ms 9856 KB Output isn't correct
8 Halted 0 ms 0 KB -